Display the cancel button on the input screen

It is highly recommended to display the cancel button in addition to the
OK button on the input screen according to GSMA PDATA.12 - SIM Toolkit
Device Requirements to improve Mobile Connect Customer Experience. The
result code shall be 0x10 - Proactive UICC session terminated by the
user.

Bug: 67083833
Test: Confirmed that the cancel button is added and works as expected.

Change-Id: Ifd73a970a9be19b1c064887be39fe813fa0ca1a5
2 files changed